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<head>
    <meta charset="UTF-8">
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    <title>Document</title>
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    <style>
        .box{
            width: 1000px;
            margin: 100px auto;
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</head>
<body>
 <div class="box">
    <div class="panel panel-primary">
        <div class="panel-heading">
          <h3 class="panel-title">英雄列表</h3>
        </div>
        <div class="panel-body">
         <div class="hero_tool">
            <div class="input-group">
                <input type="text" class="form-control" placeholder="Search for...">
                <span class="input-group-btn">
                  <button class="btn btn-default" type="button">Go!</button>
                </span>
              </div>
         </div>
         <div class="hero_table">
         
         </div>
        </div>
      </div>
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</body>
</html>